package cn.itcast.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(value = {"/addStudent.jsp","/listStudent.jsp"})
public class FilterDemo implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        response.setContentType("text/html;charset=UTF-8");
        Object username = request.getSession().getAttribute("username");
        if (username == null ||"".equals(username)){
            response.sendRedirect(request.getContextPath() + "/login.jsp");
        }
        filterChain.doFilter(request,response);
    }
}
